Kruger, 41, sparked rumors of her pregnancy at the 2018 Cannes Film Festival, where she wore a variety of loose-fitting outfits during the event. (The German-American actress took home the festival’s best actress prize in 2017 for her German-language film In the Fade.)

Kruger and Reedus, 49, first met while filming the 2015 movie Sky, in which Kruger’s character embarks on a journey of self-discovery after leaving her husband and getting romantically involved with Reedus’ character.

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Kruger previously dated The Affair star Joshua Jackson (who costarred with Reedus and Kruger in Sky) for a decade before breaking up in summer 2016. Reedus was in a five-year relationship with model Christensen, 49, whom he split from in 2003.

“I didn’t know [Reedus] before the film,” Kruger told PEOPLE in 2016 of the now-couple’s time together filming Sky. “We share a lot of intimate scenes. I was really nervous about meeting him and not being able to have a drink with him, or talk with him.”